In Figure 3, our third example is where the query result is limited to top-N elements.

在图3中是我们的第三个例子，其中，查询结果被限制在头n个元素。

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It's more work to deal with more complicated N+1 query situations.

处理复杂的 N+1 查询情况需要更多的工作。

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The query optimizer might come up with a different query execution plan tailored to provide good performance for fast retrieval of first 'n' rows rather than all the result rows.

查询优化器可能得出一个不同的查询执行计划，这个计划可以专门为最快地获取前' N '行，而不是所有结果行提供良好的性能。

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